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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 Amdocs
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.sparky.util;
/**
* The Class EncryptConvertor.
*/
public class EncryptConvertor {
private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray();
/**
* toHexString(String) - convert a string into its hex equivalent.
*
* @param buf the buf
* @return the string
*/
public static final String toHexString(String buf) {
if (buf == null) {
return "";
}
return toHexString(buf.getBytes());
}
/**
* toHexString(byte[]) - convert a byte-string into its hex equivalent.
*
* @param buf the buf
* @return the string
*/
public static final String toHexString(byte[] buf) {
if (buf == null) {
return "";
}
char[] chars = new char[2 * buf.length];
for (int i = 0; i < buf.length; ++i) {
chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4];
chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F];
}
return new String(chars);
}
/**
* Convert a hex string to its equivalent value.
*
* @param hexString the hex string
* @return the string
* @throws Exception the exception
*/
public static final String stringFromHex(String hexString) throws Exception {
if (hexString == null) {
return "";
}
return stringFromHex(hexString.toCharArray());
}
/**
* String from hex.
*
* @param hexCharArray the hex char array
* @return the string
* @throws Exception the exception
*/
public static final String stringFromHex(char[] hexCharArray) throws Exception {
if (hexCharArray == null) {
return "";
}
return new String(bytesFromHex(hexCharArray));
}
/**
* Bytes from hex.
*
* @param hexString the hex string
* @return the byte[]
* @throws Exception the exception
*/
public static final byte[] bytesFromHex(String hexString) throws Exception {
if (hexString == null) {
return new byte[0];
}
return bytesFromHex(hexString.toCharArray());
}
/**
* Bytes from hex.
*
* @param hexCharArray the hex char array
* @return the byte[]
* @throws Exception the exception
*/
public static final byte[] bytesFromHex(char[] hexCharArray) throws Exception {
if (hexCharArray == null) {
return new byte[0];
}
int len = hexCharArray.length;
if ((len % 2) != 0) {
throw new Exception("Odd number of characters: '" + String.valueOf(hexCharArray) + "'");
}
byte[] txtInByte = new byte[len / 2];
int counter = 0;
for (int i = 0; i < len; i += 2) {
txtInByte[counter++] =
(byte) (((fromHexDigit(hexCharArray[i], i) << 4) | fromHexDigit(hexCharArray[i + 1], i))
& 0xFF);
}
return txtInByte;
}
/**
* From hex digit.
*
* @param ch the ch
* @param index the index
* @return the int
* @throws Exception the exception
*/
protected static final int fromHexDigit(char ch, int index) throws Exception {
int digit = Character.digit(ch, 16);
if (digit == -1) {
throw new Exception("Illegal hex character '" + ch + "' at index " + index);
}
return digit;
}
}
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